Self-propelled toy glider

ABSTRACT

A self-propelled toy glider includes a flexible frame and a flight surface. The flexible frame may deformed and held within the user&#39;s hand. When deformed, the flexible frame stores spring energy. This spring energy is subsequently used to propel the self-propelled toy glider forward as it returns to original shape. Related to glider durability and overall safety, the flexible frame can elastically deform when the toy glider impacts objects during flight.

REFERENCE TO RELATED APPLICATION

The present application claims priority to U.S. provisional application62/399,118, filed Sep. 23, 2016, which is herein incorporated byreference in its entirety.

FIELD

Embodiments relate, generally, to a toy glider. More specifically, a toyglider with a flight surface and an elastically deformable frame,wherein the elastically deformable frame provides a mechanism for aself-propelled launch.

BACKGROUND

Toy and recreational gliders are popular among children and adults,ranging from simple paper airplanes to more sophisticated remote-controlmodels. These gliders provide an entertaining and educationalopportunity to explore aviation, aerodynamics, and physics.

SUMMARY

Embodiments can be directed to a toy glider with a flight surfacesupported by a frame. At least a portion the frame can elasticallydeform to provide spring energy for self-propelling the toy gliderduring a launch. The frame also adds to the durability and safety of thetoy glider, since it reduces the glider's impact force when collidingwith other objects.

BRIEF DESCRIPTION OF THE DRAWINGS

The particular features and advantages of the various embodiments, aswell as, other objectives will become apparent from the followingdescription taken in connection with the accompanying drawings in which:

FIG. 1 shows a top perspective view of a first embodiment of a gliderwith a flight surface and flexible frame.

FIG. 2 shows an exploded top perspective view of the glider of FIG. 1 toinclude a flight surface, nose element, and flexible frame.

FIG. 3A shows a top view of the glider shown in FIG. 1 with a shapechange when subjected to compressive forces; FIG. 3B shows the glider ofFIG. 1 in a compressed shape, held within a hand of the user; and FIG.3C shows the glider of FIG. 1 released and in flight.

FIG. 4A shows a top perspective view of second embodiment of a gliderhaving a flexible frame, flight surface, nose element, and alongitudinal element; and FIG. 4B shows a bottom perspective view of theglider shown in FIG. 4A to include an attachment element associated withthe nose.

FIG. 5 shows a bottom perspective view of the glider shown in FIG. 4Aassociated with a rubber-band catapult launcher.

FIG. 6A shows a top perspective view of a third embodiment of a gliderhaving a flexible frame, flight surface, and nose element; and FIG. 6Bshows a portion of the flight surface folding in a prescribed mannerwhen subjected to compressive forces.

FIG. 7 shows a top view of a fourth embodiment of a glider to include anelastic frame and a flight surface.

DETAILED DESCRIPTION

FIG. 1 shows a first embodiment, glider 100, to include flight surface120, flexible frame 130, nose element 150, fasteners 152, and fingerhold 156. An exemplary construction pertaining to a glider can involvesewing a fabric surface to a flexible frame using a peripheral hem.Accordingly, FIG. 1 shows flight surface 120 and flexible frame 130attached by hem 140 and stitching 142. By way of example, hem 140 may befolded fabric. Alternatively, a hem may be integral with flight surface120 and folded around flexible frame 130. FIG. 1 also shows axis A-Aperpendicular to flight surface 120. To provide aerial stability, flightsurface 120 may be cambered or arcuate, as shown by line B-B. Flightsurface 120 can be comprised of left wing surface 122, right wingsurface 124, and tail surface 126. Nose element 150 may provide forwardweight to lead glider 100 through the air. As described in greaterdetail in subsequent sections, glider 100 can assume an elasticallydeformed shape for a self-propelled launch.

Flight surface 120 may be constructed of any number of thin flexiblematerials, to include polymer fabric, polymer sheet, or natural fiberfabric. Examples of a polymer fabric include nylon or rip-stop nylon. Anexample of a polymer sheet is Tyvek®, made from high-densitypolyethylene fibers. An example of a natural fiber fabric is cotton.Flight surface 120 is of sufficient surface area and shape for glidingflight of glider 100. Hem 140 and stitching 142 are shown as a mechanismto attach at least a portion of flight surface 120 to flexible frame130. The flight surface 130 may also be secured to flexible frame 130using a variety of attachment mechanisms, to include glue, thermalwelding, and fasteners. In its entirety, or in designated regions,flight surface 120 may be porous to allow air to pass thru duringflight. This may be advantageous applied to achieve certain aerodynamicstability and glide angle characteristics, and may reduce glider weight.Flight surface 120 may be advantageously designed to billow duringflight, that is, a flight surface may or may not be attached to frame ina taut manner. Glider 100 may be further defined by a forward portion172 and an aft portion 174.

At least a portion of flexible frame 130 is designed for elasticdeformation. Flexible frame 130 may be constructed from metal, plastics,composite materials, and combinations thereof. An example of a preferredmaterial is spring-steel. Another example material for flexible frameconstruction is fiberglass. To achieve desirable strength, stiffness,and aerodynamic characteristics, frame may have a varying cross-section.As examples, cross-section of flexible frame 130 may be circular (asshown), but it may also be non-circular to achieve desired directionalstiffness and strength properties. As an example, a rectangularcross-section may have a height greater than the width. This particularrectangular configuration may be easier to compress to establish springforces, yet have greater strength and stiffness to support verticalloads during flight. Alternatively, the frame may have an aerodynamicshape to reduce drag or otherwise create aerodynamic lift during flight.

A frame may partially or completely define the outer shape of the glideror flight surface. As an example, flexible frame 130 of glider 100(FIG. 1) is aligned with the outer shape of wing portion 172 and theouter shape of tail portion 174, completely defining the outer shape ofthe glider. Alternatively, a flexible frame may only form a portion ofthe glider. As an example, an elastically deformable frame may simplyform a fuselage or a portion of a fuselage.

FIG. 2 is an exploded view of glider 100, to include flight surface 120,flexible frame 130, nose element 150, and hem 140. Nose element 150 isconfigured with slot 154 to enable fixation to flexible frame 130. Noseelement 150 is fastened to flexible frame 130 using fasteners 152 incombination with fastener holes 153. Fasteners 152 and correspondingfastener holes 153 may at least be partially threaded or may incorporatea non-threaded fastening mechanism, such as, a rivet connection. Noseelement 150 may also be fastened by adhesives to frame 130 or flightsurface 120. Exemplary materials for fastener 152 include metals,plastics, or composites, and combinations thereof. Nose element 150 hasfinger hold 156 in the form of a dimple shape to facilitate holdingglider 100 in a deformed shape, as described in subsequent section.Finger hold 156 may take the form of a dimple (shown), protrusion, orhole. Nose element 150 may be at least partially comprised of plastic,metal, or foam, the latter a common glider material for absorbingimpact. Nose element 150 may be slidably connected to frame 130 forselective lateral positioning, where the nose element 150 can provide aweight-based mechanism for trimming glider 100 to follow a straightflight path or an arcuate flight path.

A flexible frame can include a beam element or a series ofinterconnecting beam elements arranged to achieve a desired shape andspring stiffness. Substantially long and relatively thin beams areinherently flexible, so a preferred glider frame or frame section may bedescribed as a beam or beam element, wherein the length of beam or beamelement is substantially greater than any dimensional width, height, ordiameter associated with the beam's cross-section. With continuingreference to FIG. 2, flexible frame 130 may defined as a series ofinterconnecting arcuate or straight beam elements collectively achievinga desired shape and spring stiffness. Concurrently, flexible frame 130has an overall shape to peripherally support flight surface 120. Morespecifically, flexible frame 130 may be further defined as havingforward frame portion 132 and aft frame portion 134. Forward frameportion 132 may be defined as a segment of flexible frame 130 extendingfrom point U to point V and may further be described as an arcuate beamelement. Aft frame portion 132 may be defined as a segment of flexibleframe 130 extending from point X to point Y. Forward frame portion 132may be defined as a segment of flexible frame 130 forming an arcuate,elongated beam element or segment.

Glider 100 exhibits a beneficial degree of flexibility that enablesspring-energy to be stored prior to flight as a result of a shape changeof flexible frame 130. Accordingly, FIGS. 3A, 3B, and 3C demonstrate apreferred method for advantageously launching glider 100. The arrowsshown in FIG. 3A represent opposing forces applied to glider 100,demonstrating the ability of glider 100 to change shape. Morespecifically, glider 100 is shown in a first shape 180′ (at rest) andsecond shape 180″ (compressed). At least a portion of flexible frame 130is able to store spring forces associated with elastic deformation. Thiselastic deformation can be associated with beam bending and may beaccompanied by beam torsion. Elastic deformation of the flexible frame130 may be associated with a degree of twisting of the elastic frame. Byway of example, wing surface 122 and right wing surface may twist abouttheir longitudinal axis. Referring now to FIG. 3B, a user is able tocompress glider 100 toward a second shape 180″. Finger hold 156 (FIG.3A) may be used to assist the user compress and hold glider 100 insecond shape 180″. More specifically, a force may be applied to forwardportion 172 and an opposing force is applied to aft portion 174. Withcontinued reference to FIG. 3B, glider 100 assumes second shape 180″with elastic potential energy stored in flexible frame 130. Accordingly,flexible frame 130 is deformed to store elastic spring force, readilyavailable to provide a launching force. As shown in FIG. 3C, the userreleases glider 100 into flight as aft portion 174 of glider 100 pushesagainst the user's hand. During this self-propelled launch, glider 100transitions back to first shape 180′ (natural shape at rest or inflight). A user's hand is shown in an exemplary mode of operation,however, any number of means and objects can be used to compress glider100 and provide a suitably platform for a self-propelled launch.

The glider can be essentially programmed with the appropriate thrust toprovide a good flight. In part, this programming of flight thrust is acombination of frame geometry, material properties, and the extent ofdeformation. Unlike many other hand-launched gliders, the embodimentsdisclosed herein may require less finesse to achieve a desirable flight.This is especially appealing to younger children that might otherwisestruggle with the traditional hand-launch of a toy glider, but mayotherwise be fully capable of holding and releasing an object. Inaddition, combining arm and hand movements can initiate longer flightsor produced curved trajectories.

Durability of toy gliders remains problematic. Free flight gliders oftenstrike stationary objects and may become damaged or cause damage to theobject they strike, especially when the glider is used indoors. Theflexible frame and compliant flight surface of certain embodiments mayprovide a lightweight and durable glider because impact forces can beabsorbed by the frame upon impact with an object. More specifically,impact forces are diminished, as at least a portion of kinetic energy isstored upon impact as elastic potential energy through elasticdeformation of the flexible frame, ultimately released again as kineticenergy as the glider rebounds away from an object. As an example, frame130 of glider 100 of FIG. 1 can store spring energy upon impact andrebound against objects it strikes. Accordingly, the inventive aspectsof the present glider provide an improved glider with advantageousdurability associated with a high degree of safety for users and objectsthe glider may strike.

A second embodiment, glider 200, is shown in FIGS. 4A and 4B. Similar toglider 100, glider 200 has flight surface 220, frame 230, and noseelement 250. Line C-C defines an axis substantially vertical duringlevel flight. Flight surface 220 is attached to frame 230 by hem 240.Hem 240 is sewn or otherwise bonded to secure flight surface 220 toframe 230. Flight surface 220 can be comprised of left wing surface 222,right wing surface 224, and tail surface 226. At least a portion offrame 230 may be purposefully and temporarily deformed to store springforces for launching glider 200. Glider 200 is also comprised of centralstrap 228 and pull tab 229. FIG. 4B shows a bottom-perspective view ofglider 200, and particularly shows attachment element 258 for attachingother components, such as, a tether or rubber-band launcher.Alternatively, attachment element 258 can be used as a finger hold for atraditional hand-launch, wherein glider 200 may be tossed in the mannerof launching a paper airplane.

Like glider 100, glider 200 can be launched in a similar manner bydeforming frame 230, especially in compression, followed by aself-propelled launch by hand as elastic potential energy is convertedto kinetic energy (see FIGS. 3A thru 3C). For longer flights, especiallyoutdoors, glider 200 can also be launched by using a rubber band-basedlauncher. Referring now to FIG. 5, glider 200 is shown coupled with arubber band launcher 260. The rubber band launcher 260 includes handle262 and rubber band 264. Related to a method of launching glider 200,one hand holds handle 260 and the other hand is used to grab pull tab229 and load rubber band 264 in tension for launch (user's hands are notshown). Accordingly, FIG. 5 shows glider 200 ready for launch, as rubberband 264 is loaded in tension. The user launches glider 200 by releasingpull tab 229. Central strap 228, may be configured as a substantiallynon-elastic member, serving as a tension band, to prevent glider 200from being overstretched. As an example, central strap 228 may be awoven nylon strip. Conversely, central strap 228 may be configured witha degree of elasticity to provide spring forces for launch whentensioned.

Alternatively, an attachment element, such as attachment element 258 ofglider 200, can be used to attach a tether. As an example, a tether canbe a slender, flexible ribbon constructed of a synthetic or naturalfabric. One end of the tether may be permanently attached to the glideror it may have a release mechanism. By holding the free end of thetether, the user is able to propel glider 200 in a circular motion andoptionally release the tether to propel glider 200 into free flight.

A third embodiment, glider 300, is shown in FIG. 6A, to include flightsurface 320, frame 330, and nose element 350. Flight surface 320 haspatterned creases, allowing it to fold in a manner similar to a foldablefan. More specifically, flight surface 320 is formed in part by creases325 and creases 327. Flight surface 320 may be formed from a plasticsheet with a capacity for elastic deformation. Viewed as a partiallateral cross-section, FIG. 6B shows a portion of flight surface 320 inat partially compressed state. Compression forces are indicated by thearrows. More specifically, the crease pattern is formed by alternating afirst crease 325 and second crease 327, predisposed to fold flightsurface 320 in compression. Flight surface 320, as an example, can be aplastic sheet, capable of deforming in a fan-like or accordion-likemanner when pre-creased and subjected to compression. Further, at leasta portion of the aforementioned deformation of flight surface 320 can beelastic deformation, wherein spring forces are stored for launch. Atleast a portion of frame 330 can store spring energy by elasticdeformation, similar to aforementioned gliders described herein. Likeglider 100, glider 300, can be launched by introducing a shape change(see FIGS. 3A, 3B, and 3C).

A fourth embodiment is shown in FIG. 7, glider 400, comprised of frame430 and flight surface 420. Flight surface 420 can be comprised of leftwing surface 422, right wing surface 424, and tail surface 426. At leasta portion of frame 430 is capable of storing spring forces when frame430 experiences a shape change. Stored spring forces may be stored forself-propelled launch and may created by deforming frame in a variety ofshapes, to include elongation or compression longitudinally. Flightsurface 420 may be at least partially attached to frame 430 using avariety of methods, to include, adhesives, welding, thermal melting, orhem and stitch, as examples. Glider 400 is shaped as a flying wing andframe 430 can further be defined by forward frame region 432 and rearframe region 434. Forward frame region 432 may have a degree of elasticflexibility to absorb impact. Rear frame region 434, defined as thetrailing edge of wing, may be considered an elongated beam element,having a different degree of elastic flexibility to store spring-forcesfor a self-propelled launch.

Certain embodiments described serve as examples and should not limit thescope and spirit of the present invention. Our experience has shown adegree of twisting or other distortion in 3D space may accompanycompressive loading of the frame longitudinally. The construction of aperipheral frame defining the outer boundary of the glider may create aglider that can be folded and collapsed thru twisting of the frame,creating a smaller package for travel. In addition, any number ofcomponents known in the art can be added to enhance flight, to include avertical stabilizer, flaps, and landing gear. Many elements may beadjustable to trim the glider or establish certain flight trajectories.In addition, portions, or the entirety of the flexible frame may be bentto trim the aircraft for optimal flight or to otherwise change theflight trajectory.

1. A glider comprising: (a) a flexible frame; (b) a flight surface,wherein the flight surface is comprised of a fabric material that iscoupled with the flexible frame; (c) a nose element, the nose elementbeing coupled with the frame, wherein the nose element is weighted andis coupled to the flexible frame with a plurality of fasteners, and (d)a finger hold, the finger hold being at least partially defined by theflexible frame.